kibby



(No Model.)

D. W'. KELLOGG au W. A. KIRBY.

STEAM BOILER..

Patented 1390.28, 1886L NA PETERS, Pho'to-Lkhgriphur, Wnhingion. RCS

Nrrnn STATES DAN W. KELLOGG AND WILLIAM A. KRBY, OF AUBURN, NEW YORK.

STEAM-Bonne.

SPECIFICATION forming part. of Letters Patent No, 355,176, dated December 28, 1886.

Application tiled December 2l, 1885. Serial No. 186,294. '(No model.)

containing a central magazine for coal, and the.

objects of our invention are to provide means for rapidly converting water into steam, and superheating said steam and automatically controlling the air-supply.

Other objects and advantages of our invention will appear in the following description, and the novel feature thereof will be particularly pointed out inthe claims.

The drawing represents a central vertical section of a steam-boiler constructed in accordl ance with our invention.

To a suitable annular base, A, forming the ash-pit, to which access is had through a door, A', is arranged in any suitable manner the grate B, which may be shaken by the lever B'. The base is provided with an inwardly-pro j'ecting annular flange, A2, upon which is mounted the body of the steam-generator, consisting of an inner circular plate, C, and an outer concentric plate, C'. Said plates are connected at the bottom, either by flanging both plates outwardly and riveting their flanges together, or by other well-known means, .and they are connected at the top by ilanging the inner plate outwardly against the outer plate and riveting them together, and thereby forming a narrow annular water-chamber, C2, around the fire-box of the generator. To the inner plate, C, a short distance above the grate B, are attached a series of brackets, D, to support a long coil, E, having its lower end suitably secured at e to the inner plate, C, and connecting withr its water-chamber, while its upper end is similarly connected ate to said inner plate, and to reach the fastenings, so as to tighten them, hand-holes are formed opposite them in the outer plate, that are closed by small cap-plates el. `The long pipe E is coiled inwardly to form a horizontal coil, the inner end of which is bent on an ascending spiral to form the inner coil, that is bent out wardly to form a horizontal coil above the first one, and when it has nearly reached the outer periphery of the first coil it is bent upward to form the outer end-of the spiral coil, thatis bent inwardly, as statedfor the lower coil, and the operation is repeated until the desired number of coils is formed, the series Yof coils being vertically staggered to cause the products of combustion to follow a zigzag course among them.

The upper or discharging end of the coil E is located above the level of the water in the boiler, so that there is no interference with the escape of steam from said coil into the upper end or steam-chamber of the boiler. This arrangement of the coil is also described in a companion application filed by William A. Kirby.

To increase the temperature of the steam received in the steam-chamber and superheat it ou its way to the escape-pipe F, it is made to circulate through a large flat coil, F', se-l cured at f to the inner shell of the boiler and communicatingwith its steam-chamber. Upon one side of the escape-pipe there is a branch pipe carrying a safety-valve, G, of usual construction. f

The boiler proper is inclosed in a jacket, H, the upper end of which forms a smoke-chamber, out of which the products of combustion escape through the smoke-pipe H', in which is pivoted the damper H2 to modify the direction of the draft. i

To indicate the amount of water in the boiler and regulate the draftand its direction, there is inserted in the lower portion of the outer plate of the boiler a horizontal pipe, I, through which the feed-water is admitted into the boiler. Upon the pipe I is mounted a vertical pipe, K, carrying a branch pipe, K', that is in communication with the steamchamber of the boiler, and connected with the upper end of IOO the ashes is closed by a door, A, hinged at the side to the base A, and hinged to the npper edge of the door A is a smaller or draft door, N, having attached close to its lower edge and adjoining the hinges of the larger door A a chain, N2, the upper end of which is secured to the end of the lever M at a short distance from its pivot m, so that any elevation of the stem of the diaphragm-valve will have a tendency to close the draft-door N. To reduce at the same time the updraft of the products of cornbustion to the smoke-pipe H', there is hinged to the side of the latter a pendent valve, N, the lower edge of which is connected by a chain, N4, to the opposite end of the lever M,

`from which the lower draft-chain, N2, is pendent, so that while the bottom draft-door, N, becomes closed the upper valve or draft-door, N3, becomes open. To the side of the pipe K, at a point coinciding with the top of the water in the boiler, is secured a glass gage, l), of ordinary construction.

Within the center of the boiler is placedthe magazine Q. Its upper end is provided with a cap, Q', having its lower edge resting upon the top of the boiler and its upper edge turned inwardly, and upon the latter is placed the cover Q2, and'adjacent thereto projectsupwardly a pipe, Q3, to carry any gas that may be formed in the magazine. Centrally under the lower end of the magazine there is secured upon the grate-bars of the grate B a hollow cone, R, formed independently of said grate,` and having ne perforations r therethrough to admit air within the mass of coal usually collected on the grate directly under the magazine, keep the grate comparatively cool at that point, and at the same time deecting the coal toward the side of the boiler, where it is most needed to heat the body of the boiler and the coil E, placed therein.

Having now fully described our invention, we clai 11i- 1. rl he combination of the concentric inner and outer shellsof the boiler and its central magazine with aywater-pipe surrounding said magazine, and having its lower end attached to the boiler substantially opposite .the lower end of the magazine, and first coiled inwardly toward the magazine, followed by another coil extending outwardly,`the series of coils being staggered one above the other, substantially as and for the purpose described.

2. The combination of the concentric inner and outer shells of the biler and the watercoil within having its lower end connected with the body of the boiler at a point substantially on a level with the lower end of the magazine, and its upper coil above the waterline in the boiler, with a superheater located above said upper coil, and a magazine in the centerof the coil, substantially as described.

8. The combination of they inner and outer shell of the boiler, its coil and jacket, anda smoke-pipe issuing vert-icallyfrom said jacket, with a magazine provided with a cap resting thereon, said cap having its upper edge turned inwardly, and a pipe projecting upward from the upper bend thereof, substantially as and for the purpose described.

4. The combination of the inner and outer shell of the boiler, its coil and magazine within said coil, with the jacket H, smoke-pipe H', projecting vertically from `said jacket, and pendent valve N3, hinged to said smoke-pipe, substantially as and for the purpose described.

In testimony whereof we affix our signatures in presence of two witnesses.

DAN W. KELLOGG. WILLIAM A. KIRBY.

Witnesses:

F. M. SMITH, HENRY OBRIEN. 

